'use strict';

var cmdHelper = require('./CmdHelper'),
    elementHelper = require('bpmn-js-properties-panel/lib/helper/ElementHelper');

var is = require('bpmn-js/lib/util/ModelUtil').is;

var ExtensionElementsHelper = {};

var getExtensionElements = function (bo) {
    return bo.get('extensionElements');
};

ExtensionElementsHelper.getExtensionElements = function (bo, type) {
    var extensionElements = getExtensionElements(bo);
    if (typeof extensionElements !== 'undefined') {
        var extensionValues = extensionElements.get('values');
        if (typeof extensionValues !== 'undefined') {
            var elements = extensionValues.filter(function (value) {
                return is(value, type);
            });
            if (elements.length) {
                return elements;
            }
        }
    }
};

ExtensionElementsHelper.addEntry = function (bo, element, entry, bpmnFactory) {
    var extensionElements = bo.get('extensionElements');

    // if there is no extensionElements list, create one
    if (!extensionElements) {
        // TODO: Ask Daniel which operation costs more
        extensionElements = elementHelper.createElement('bpmn:ExtensionElements', {values: [entry]}, bo, bpmnFactory);
        return {extensionElements: extensionElements};
    } else {
        // add new failedJobRetryExtensionElement to existing extensionElements list
        return cmdHelper.addElementsTolist(element, extensionElements, 'values', [entry]);
    }
};

ExtensionElementsHelper.removeEntry = function (bo, element, entry) {
    var extensionElements = bo.get('extensionElements');

    if (!extensionElements) {

        // return an empty command when there is no extensionElements list
        return {};
    }

    return cmdHelper.removeElementsFromList(element, extensionElements, 'values', 'extensionElements', [entry]);
};

module.exports = ExtensionElementsHelper;
